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<head>
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    <title>20231107131+陈哲+第4章复习</title>
    <style type="text/css">
        div{
            border: solid 1.5px;
            width: 150px;
            height: 37px;
            margin: 5px;
            
        }
        #big{
            width: 489px;
            height: 150px;
            border: solid medium ;
        }
        .left{
            float: left;
            align-items: center;
            display: flex;           
        }
        .first{
            width: 231.5px;
            float: left;
            align-items: center;
            display: flex;
        }
        .end{
            width: 109.25px;
            float: left;
            align-items: center;
            display: flex;
        }
        
    </style>
</head>
<body>
    <div id="big">
        <div class="first">1</div>
        <div class="first">2</div>
        <div class="left">3</div>
        <div class="left">4</div>
        <div class="left">5</div>
        <div class="end">6</div>
        <div class="end">7</div>
        <div class="end">8</div>
        <div class="end">9</div>
    </div>
</body>
</html>